Die oplosbaarheid en mobiliteit van kalk in sand

The solubility and mobility of lime in sand: The dissolution, diffusion and leaching of two agricultural limestones were studied in a pure sand medium. By using sand, the complicating effect of the exchanger phase of soil was eliminated. The effect of additions of KCI, NH4CI, Na2EDTA, organic matter...

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Published in: South African journal of plant and soil Vol. 3; no. 3; pp. 140 - 146
Main Author: Van der Watt, H. v. H
Format: Journal Article
Language: Afrikaans
English
Published: Taylor & Francis 08-01-1986
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Summary: The solubility and mobility of lime in sand: The dissolution, diffusion and leaching of two agricultural limestones were studied in a pure sand medium. By using sand, the complicating effect of the exchanger phase of soil was eliminated. The effect of additions of KCI, NH4CI, Na2EDTA, organic matter and a H-saturated exchange resin on lime dissolution and Ca-mobility was determined. The diffusion of Ca and other ions in unleached columns over periods, of 5 and 9 months was measured at two water contents. After 5 months more than 99,5% of the applied Ca was still found in the lime-containing segment of the unleached columns at a water content slightly above field capacity. KCI had a very limited effect on Ca dissolution and distribution; NH4CI was somewhat better in this regard, while NH4CI + a H-saturated resin at 100 mm from the lime-containing band fared best. Even in the latter case more than 80% of the Ca was still found in the lime band after 9 months. In the leached columns, 8 treatments at irrigation levels of 600 mm and 1200 mm were compared. Leaching with 1200 mm water resulted in the removal of 18,1% and 9,6% Ca from the two limes respectively, whereas up to 46,1% and 54,8% was removed by NH4 CI and EDTA solutions, respectively. The addition of organic matter had very little effect on Ca dissolution.
ISSN: 0257-1862
2167-034X
DOI: 10.1080/02571862.1986.10634209